Big Willy had a problem. At just over six feet tall and almost five hundred pounds, he was as fat as he was black. His arms were fat, his legs were fat, even his face was fat, and his gut hung out so far that he couldn't find a shirt that would cover it. The bottom of his belly always peeked out between the football jerseys and sweat pants he always wore.
But that wasn't his problem. Big Willy's problem was that his balls were as fat as the rest of him, and they needed to be drained as often as possible. Wherever he was, whenever he felt it, he had to find some way to relieve the pressure, or he could barely walk. He tried not to get excited, but sooner or later something would get him going, and then he had to bust a nut any way he could.
The day was going fine until Willy walked by a small fitness center in a strip mall. There was only one person inside, a skinny, toned white girl with long straight brown hair. She wore a tight gray spandex tank top, cut off just below her cute tits to show off her midriff, and little purple spandex shorts.
He vaguely noticed her white sneakers, but she was using a stair machine with her back to the large front windows, and all Willy could see was her tight, toned ass moving up and down as she worked out.
He felt his big thick cock begin to fill and swell, and his balls expanded until they ached. He couldn't look away from that tight little ass bobbing and swaying to her stepping motions. He had to have that ass.
Katie knew she was hot, and she used that little detail to the full extent whenever possible. When she opened her own private fitness center and became a weight trainer, she made sure she worked out in full view of the parking lot whenever possible, most of the time with her back to the windows, showing off her ass.
Guys would come in and sign up under the delusion that they stood a chance to date her, and girls would sign up under the delusion that she could make them look like her. It was perfect.
A knowing smile crept over her pretty face when she heard the front door open behind her, jingling the little bell above the entrance. She'd been showing off her ass for over half an hour. She knew it was only a matter of time before someone took the bait. She took a quick swig from her water bottle and stepped down.
"Welcome to Katie's Fitness, can I helpβ" Katie said as she turned around to greet her new customer, then froze. "Or maybe I can't help him. Holy crap." Katie thought to herself, staring in shock at the morbidly obese black man standing in front of her.
"I'm sorry, um, I don't think there's anything I can do for you..." the cute fitness instructor said, trying very hard not to laugh. "I mean, what is he thinking?" she thought to herself. "Oh don't you worry, sweet thang, dere is one ting you can do fo' me." Willy said, and dropped his sweat pants.
Katie froze. Her water bottle fell to the floor and spilled out in a puddle behind her, but she didn't even notice. Her big brown eyes couldn't help but look down when he dropped his baggy gray sweat pants, and below his giant round gut was a monstrous cock bigger, fatter and blacker than she ever thought possible.
As a fitness instructor, she thought she knew what sizes and shapes the human body was capable of, but this was not like anything she had seen before. The muscle jocks and the suburban dads would often get cute little hard-ons when she worked with them, but this was no comparison. Was it because he was so fat, or so black?
"I only got dis one muscle I need you to work on, girl." Willy said, wrapping a big hand around his shaft and beginning to stroke it slowly while he took a step toward her. He could barely get his hand under his gut, which was why he really needed a girl to "help" him when he got this way. Jerking off was nearly impossible for him.
She looked horrified, but Willy noticed that she couldn't stop staring. They could never stop staring, every time he did this. He would get swollen, find some cute thing he could be alone with, and one way or another, she would get him off sooner or later. This one didn't look any different.
"Fuck... what... how?" Katie stuttered, barely capable of speech. Now it was Willy's turn to hold back a laugh, but he didn't do as well and let out a deep chuckle.